Commutator-brush for electric generators and motors.



P. P. NUNGESSER.

GOMMUTATOR BRUSH FOB. ELECTRIC GENERATORS AND MOTORS.

APPLICATION FILED MAY 19, 1911.

Patented July 15, 1913.

2 SHEETSSHEET 1.

. DYYEJYTOR Fm'dm P. HumaEssER q 'M ATTYS.

Arrrsz P. P. NUNGESSER. OOMMUTATOR BRUSH FOR ELEOTRIG GENERATORS ANDMOTORS.

APPLIGATIOZI FILED MAY 19, 1911. 1,067,620. Patented July 15, 1913 ZSHEETS-SHEET Z Fig.8

flrri I [HYZZYTOIZ W/ PHILIP NUNGESSER K. I BY Z'ALPWW 1mg.

UNITED TATES FATE I canton.

PHILIP P. NUNGESSER, 0F CLEVELAND, OHIO, ASSIGNOR TO THE NUNGESSER ELEC-TRIO BATTERY COMPANY, OF CLEVELAND, OHIO, A CORPORATION.

COIlIIlIUTA'lGR-BRUSH FOR ELECTBIC'GENERATORS ANDJHOTORS.

Application filed May 19,,

b all whom it may concern:

Be it known that I, PHILIP P. Nunenssnn, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio. haveinvented certain new and useful improvements in Commutator- Brushes forElectric Generators and Motors, of which the following is aspecification.-

My invention relates to commutator brushes for electric generators andmotors, all substantially as shown and described and particularlypointed out in the claims.

i Tn the accompanying drawings, Figure 1 is a perspective view of thebrush with a flexible wire conductor attached thereto. Fig. 2 is asectional elevation of the carbon shown in Fig. 1, and Fig. 3 is aperspective view of the screws for fastening the cap and conductingparts on the brush together. Fig. '-'l is a perspective view of theconductor and contact plate, and Fig. 5 is a perspective view of the capalone. Fig. (3 shows the conductor with its strands of fine wire openedand spread apart to amplify conductivity and avoid resistance andheating, as hereinafter fully described. Fig. 7 shows the brush or bodyalone, and Fig. 8 shows the blank fonthe contact-or conducting plate.

The invention. as ithus disclosed is. designed. to overcome. (or avoid.the; trouble experienced in many m'akes (if-commutator brushes of undueresistance atthe point of connec-.

tion'between conductor and the-brush. One

of the common ways of making such connecconnections h ave not only beenvery unre} liable because of the low temperature at which the solderwould loosen or melt but the area which can be advantageously covered bysuch means is narrow at the best and therefore liable to induce heatingand destruction.

Of course I am aware that others have met the same difficulty and soughtto overcome it by various mechanical appliances and in some instancesprobably with more or less success, such,-for example as have springcontacts of more or less area, holes bored in the carbon and plugstherein for connecting the conductor. and spring clips and such likemeans, all of which I expressly disclaim. But, notwithstanding, I am notaware that the means shown and described herein have ever before beenknown or used.

Specification of Letters Patent.

. Patented July 15, 1%.3. 1911. Serial n 528,1;3.

My invention therefore consists in a carbon, graphite orlike brush B ofany suitable vmaterial ,andavith square or beveled bearing surfaceas.,.may be best suited to the particular machine with which itis em-sployed.

(1 represents a cap of copper plate, preferably but which may be of anygood con- :duct-ing metal. 1 The brush body is rabbeted or recessed at2. and 2 on opposite sides at its top a suilicient depth to comfortablyseat the-fiat sides 3 of the said cap therein and to accommodate thecontact member as hereinafterdescribed and the top of, the said brushis=furtl1er provided with, two-- transverse holes a and a slight cavity5 in itsedge. 'The cap Chas holes 7.corresponding to -the holes. 4 anda' hole 8 on its top adapted to enter the conductor D through the sameto engage Withplate P .relativelyrr as seenin' Fig. 1. The. said plate:P. likewise is of copper or other good conducting material and is shownas bent lengthwise across its middle and folded witlrits sides closelyupon eachaother except as they are; slightly spaced apart by the spreadWires 10 ofthe conductor C shown in..Fig.. 6. In construction the saidconductorconsists-ot anum er otsenanate stran sot ravi iconne wiremound. toge her. on: bout ea h Qtbenin i-ifi lali farmland. soaketeiaiaiel p 12 attl einioutera ends. oxhi ethe ianerie .iottheeaductonhas; allii s i-Wiresautvr n spaced. apart aodtsrrea tmqsei lawle onradial lines so as to produce an'unusually de ,,s 1: ece.. :,.ar. a, and' air d .v rise state's jar uit ohaiit r i aiii fiat tened. or ratherthe Wires are drawn out into about the same plane so as to bring thesame between the sides of plate P, and the entire inner portion of saidplate is filled with the said wires while the sides of the plate arepressed down close and fiat-against or upon the said wires. Thisdistributes electrical contact evenly over the entire surface of theplate and afiords such amplecontact area that resistance at this pointis eliminated and the connection remains cool and effective. The plate Phas a hole 14 of half round shape in this instance in its top throughwhich the conductor is engaged inside as seen in Fig. 4. The cavity 5 inthe brush makes room for the inner portion of the conductor at itsjunction with said plate, and the recess in'the side of the brush ismade deep enough to accommodate the plate P with the side 3 of the capoverlapping the same. The said plate also has holes 9 which registerwith the holes 4 and 7 respectively, and the clamping screws 15 and 16bind the several parts firmly to gether through these holes. The saidscrew 16 is threaded internally in which screw 15 engages, and by thesemeans the cap 0 is firmly clamped or bound upon the plate P and saidplate firmly clamped against the wall of the brush body, while theconducting wires within plate P are spread over both sides of said plateand amplify the contact. Screw 16 is upset after insertion to preventrattling ofi. In the construction thus described the doubled plate P isthe real conducting member through which the current flows from thecable or conductor D to the brush B, and cap 0 in fact is a confining 3medium with the further advantage or value of serving as a protectionfor the top of the brush. As to the said member or plate 1 it may beadded that after the small wires have been engaged therein as abovedescribed the plate is subjected to such heavy f tamping or compressionthat the wires are 5 flattened and thus as nearly incorporated with theplate as is possible without actual amalgamation or welding. No solderis used in the entire connection for various reasons, l

already indicated, and because when used between a plate and the carbonit remains serviceable only as long as the adhesion occurs, and which isliable to become detached under abnormal conditions.

The small screw 15 is uraosel located 1 l .V

on the same side as plate P so that the least possible amount of metalshall be removed to enter the screw thus preserving the conductingsurface of said plate as fully as possible and avoiding heating of theparts.

The cap 0 in addition to having a binding medium for the conductingparts serves as a contact for a pressure spring when the chief reasonfor carrying the same across the top of the carbon.

The straight edge in hole let facilitates the spreading of the smallwires at their base in the twisted portion of the cable.

The brush B may. be electro-plated at the .-;-i'lrlaccs contacted bymember P'and cap C, and opening 8 in the cap C is amply large toaccommodate free vibratory movement of cable I) therein.

What I claim is:

l. A commutator brush and a cap thereon overlapping the sides of thebrush, a conductor consisting of fine wires having said wires opened andspread. apart, a plate bent at its middle and having its sides foldedflat against each other upon the said spread portion of the conductorand clamping screws through said parts binding the same firmly upon thebrush.

2. A current-conducting connection comprising a cable of fine Wirestwisted to gether and having a portion untwisted and spread and a foldedcontact plate engaged with the spread portion and having a halfroundopening for the cable on-the line of the fold.

3. A carbon brush and cap therefor and a current-conducting cable oftwisted wire having a flattened portion, said brush, cap and flattenedportion having corresponding transverse openings, and a set of clamping1 screws projected through said openings to bind said parts together,one of said screws being upset as to the other to make permanentconnections. v

In testimony whereof I ai'iix my signature in. presence of twowitnesses.

PHILIP P. NUNGESSER. Witnesses:

R B. Mosnn, F. C. MUSSUN.

